I'm a little out of touch with photography, so some comments I'm gonna make will not make sense. So, please bare with me...
Anyway, I really feel that the picture is a bit too flat. Reasons for the picture being too flat may be many, and one of which is the focal plane. It seems as if the only focus area you'd had in the whole picture is on just one part of the lalang. Sadly, due to lack of depth of field, the rest of the lalang, which is supposed to be in close-proximity relative to the background, became just as out-of focus, making the whole feel of depth missing, hence flat. Try using a much smaller aperture next time. The increased depth of field would not bring the background into focus since the background shouldn't fall into the same focal plane.
Another reason for the picture being flat could be due to the timing. I'd no way of judging what was the timing when you took the picture, for the colour are too saturated. But my guess would be around mid-day, where the lighting seems to be uniform, and no hint of rays projecting from one way or another. Not to say that it's a no-no to take pictures during mid-day, but just that the objects you're trying to take here is perhaps not contrasty enough. The results I think could be much better if actual rays of light fall onto the lalang patch to give it more contrast, and making the whole picture less flat.
Having said that however, I do like your framing, and your effort in going down so-low. It's really a pity that lalang don't grow too tall these days. The effect would of course be much much more optimum if the lalang are much taller.